Timepiece calendar system
The timepiece calendar system ( 200 ) includes a date mobile ( 4 ) which is displaceable step by step relative to a frame ( 199 ), a first drive finger ( 21 ) for driving the date mobile ( 4 ). a first tooth ( 51 ) for driving the date mobile ( 4 ), the first tooth ( 51 ) being mounted on the date mobile ( 4 ) so as to be displaceable between a deactivated, or retracted, position and an activated, or drive, position, an activation system ( 6, 7 ) for activating the first tooth ( 51 ); the first drive finger ( 21 ) and the first tooth ( 51 ) being arranged such that a single action of the first drive finger ( 21 ) on the first tooth ( 51 ) can displace the date mobile ( 4 ) through N steps, N being an integer such that N>1, notably N=2 or N=3.
1 . A timepiece calendar system, the system comprising:
a date mobile which is displaceable step by step relative to a frame;
a first drive finger for driving the date mobile;
a first tooth for driving the date mobile, the first tooth being mounted on the date mobile so as to be displaceable between a deactivated, or retracted, position and an activated, or drive, position;
an activation system for activating the first tooth;
the first drive finger and the first tooth being arranged so that the first drive finger acting on the activated first tooth can displace the date mobile through N steps, wherein N is an integer and N>1.
2 . The timepiece calendar system according to claim 1 , wherein the activation system is arranged so that the first drive finger acting on the activated first tooth displaces the date mobile through n steps, wherein n is an integer of any value in a range of from 1 to N, depending on a moment at which the first tooth is activated by the activation system.
3 . The timepiece calendar system according to claim 1 , wherein the activation system is a desmodromic system comprising a month cam and a cam follower, the desmodromic system being arranged so that at least a first position of the month cam defines a first position of the follower allowing retraction of the first tooth, and so that at least a second position of the month cam defines a second position of the follower preventing retraction of the first tooth.
4 . The timepiece calendar system according to claim 3 , wherein the month cam and the date mobile are coaxial.
5 . The timepiece calendar system according to claim 1 , wherein the system comprises a second drive finger for driving the date mobile.
6 . The timepiece calendar system according to claim 5 , wherein the second drive finger is arranged so as to interact with a toothset of the date mobile.
7 . The timepiece calendar system according to claim 5 , wherein the first drive finger forms part of a first drive mobile, and wherein the second drive finger forms part of a second drive mobile, the first drive mobile and the second drive mobile comprising a first axis of rotation and a second axis of rotation which are separate.
8 . The timepiece calendar system according to claim 7 , wherein the first drive mobile and the second drive mobile are kinematically connected to one another by a third drive mobile.
9 . The timepiece calendar system according to claim 1 , wherein the system comprises an instantaneous drive device comprising a spring-lever and a calendar cam.
10 . The timepiece calendar system according to claim 9 , wherein the calendar cam is arranged at a third drive mobile.
11 . The timepiece calendar system according to claim 1 , wherein the system comprises a device for holding the date mobile in position and a device for minimizing or cancelling the holding torque for holding the date mobile in position.
12 . The timepiece calendar system according to claim 11 , wherein the device for minimizing or cancelling the holding torque for holding the date mobile in position comprises a cam arranged at a second drive mobile.
13 . The timepiece calendar system according to claim 1 , wherein the first drive mobile comprises a third finger for driving a day mobile.
14 . The timepiece calendar system according to claim 1 , wherein the system comprises a kinematic connection arranged so that the date mobile moves a month cam forming part of the activation system of the first tooth through 1 /m steps for at least a plurality of steps taken by the date mobile, m being a real number greater than 1.
15 . The timepiece calendar system according to claim 1 , wherein the system comprises a kinematic connection arranged so that the date mobile moves a month cam forming part of the activation system so that the month cam is displaced each month before or during a jump from a day of a month “27” to a day of the month “28”.
16 . A timepiece movement comprising a system according to claim 1 .
17 . A timepiece comprising a timepiece movement according to claim 16 .
18 . A method for operating the timepiece calendar system according to claim 1 , the method comprising:
activating the first tooth,
wherein the first drive finger acting on the activated first tooth displaces the date mobile through an amplitude of at most N steps.
19 . The method according to claim 18 , wherein the first drive finger acting on the activated first tooth displaces the date mobile through n step(s), n being an integer of any value in the range of from 1 to N, comprising repeating the first drive finger acting on the activated first tooth, so that, depending on a moment at which the first tooth is activated by the activation system, n takes each value in the range of from 1 to N.
20 . The method according to claim 18 ,
wherein, when the first tooth is activated, the first finger subjects the first tooth to a mechanical action for driving the date mobile, and/or
wherein, when the first tooth is deactivated, the first finger subjects the first tooth to a mechanical action for retracting the first tooth without driving the date mobile.